Electric heater.



PATENTED OCT. 20, 1903.

E. F. PORTER. ELECTRIC HEATER. APPLIGATION FILED JAN. 21,1899.

No. 741,927. Patented October 20, 1903.

UNiTE STATE-S ATENT QFFICE.

EDWIN F. PORTER, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE BAY STATE ELECTRIC HEAT dc LIGHT COMPANY, OF JERSEY CITY, NEV JERSEY, A CORPORATION OF NEIV JERSEY.

. ELECTRIC HEATER.

SPECIFICATION forming part of Letters Patent No. 741,927, dated October 20, 1903.

Application filed January 21, 1899. Serial No. 702,915. (No model.)

T at whom i l/ OOTLOGWII: pact of the outflowing air, which is thereby Beit known that I, EDWIN F. PORTER, a subheated. ject of the King of Great Britain, residing at My invention consists of certain novel fca Boston, in the county of Suffolk and State of tures hereinafter described, and particularly 5 Massachusetts,have invented certain new and pointed out in the claims.

useful Improvements in Electric Heaters, of In the accompanyingdrawings, which illuswhich the following is a specification. trate a construction embodying my inven- 55 My invention relates to improvements in tion, Figure 1 is a side view, partly in secelectric heaters, and is especially adapted for tion, of my apparatus. Fig. 2 is a plan view, to car-heating. also partly in section. Fig. 3 is a detail view The object of my invention is to generate showing the construction of the primary heat from electric current drawn from the heater. Fig. et is a front view, partly in sec- 60 source used for running the cars and to suption, of the secondary heater. Fig. 5 is a ply a heater of convenient construction and diagrammatic view illustrating the circuit size to be used for that purpose. through the motor and the primary and see- In the use of a heater in cars it is convenondary heaters. ient to arrange the different operating part-s Like letters of reference refer to like parts 65 so that they may be controlled by the motion throughout the several views. of one switch, and it is also necessary where A represents a motor of any desired cona circuit of a high voltage is used, as in elecstruction provided with a shaft B, on which tric railroading, to provide a motor of a small is fixed fast at its front end the fan C. and compact form. This is effected by plac- D represents the outer ring for the support 70 ing the motor in series with the heater, and of the heaters and their insulation, and said this feature is substantially the same as that ring is supported by suitable brackets E, se disclosed in a previous application filed by cured to the wall of the car. The lower me October 17, 1898, Serial No. 693,714. In bracket E (shown in Fig. 1) supports the moaddition this car-heater has another feature tor A in its position. Nithin the outer ring 75 of novelty, which is the throwing in of an Dis a ring of asbestos F, reinforced bya ring auxiliary heater in shunt with the motor and of mica G, for the purpose of insulating the in parallel with the heater, thereby increasprimary and secondary heaters H and I, re-

ing the heat without varying the speed of the spectively. fan, which displaces the heat from the heat- J is a supporting-ring of insulating mate- 8o ing-surfaces and diffuses it throughout the rial, such as slate, of the primary heater II, car. This combination of a primary heater which consists of asbestos cords K, Wound in series with the motor and one or more secwith the resistance wire L and stretched ondary heatersin shunt therewith constitutes around said ring J in the grooves J. the main feature of my invention. d represents a supporting-ring of metal 85 I have shown in the drawings a difference which carries the three heating-ringsNof the in the construction of the primary and the secondary heater I. \Vithin said ring is a secondary heaters, as the construction of the spider O, which is connected to the ring M. primaryheater has already been disclosed in The rings N are attached to the spider O by an application filed by me December 27, 1808, screws O, and said rings may be elongated 0 Serial No. 700,824; out the construction of to increase the heating-surface. the secondary heater consists of one or more It is advisable to protect the exposed face rings upon which the resistance-wire is wound, of the fan-heater, and for this purpose a wireembedded in enamel for the purpose of comgauze screen P is stretched over the front of pactness, the rings being so arranged that the ring D and held in place by the retainthe inner and outer surfaces receive the inn ing-ring P,

In Fig. 2 the switch Q is shown, which when closed causes the current to pass along the wire R, through the motor A, and along to the primary heater I-I, through the wire R, out through the wire It and R Then it is necessary to increase the heat, the switch It is thrown in, whichcauses a branch of the current to pass through the wire S to the secondary heater I and out through the wires S and R It will be seen by this arrangement that the primary heater H is in series with the motor, while the secondary heater I is in shunt with the motor, the switch Q making and breaking both circuits when the switch R is thrown in and the switch R making and breaking only the shunt-circuit.

Fig. 5 represents in diagram the circuits through the primary and secondary heaters and through the motor. The circuit enters through the wire R, passes through the switch Q, through the motor A, through the wire R, through the primary heater H, and out through the wire R and R When the switch R is closed as shown in thc diagram, a branch of the current passes through the wire S to the secondary heater I, which is shown in three sections N in series, through the wire S to the wire R and out.

In the construction of the secondary heater, Fig. 4, the wire is embedded in the enamel T, which is placed on the cast-iron ring T, fastened to the spider O, as shown, whereby mechanical strength is obtained and short-circuiting of the wires is entirely prevented, and the rings by this construction are so placed that their axes are in line with the direction of the flow of the air from the fan. Both heaters may be constructed similar to the primary or to the secondary heater, as desired.

I do not limit myself to the arrangement and construction shown, as the same may be varied without departing from the spirit of my invention.

Having thus ascertained the nature of my invention and set forth a construction embodying the same, what I claim as new, and desire to secure by Letters Patent of the United States, is

1. In an apparatus of the character specified, one or more heat-developing electric conductors forming a primary heater, movable means as a fan for removing or displacing the heat from said heater, a motor for operating said movable means, an electric conductor continuously in series with both heater and motor while the circuit is closed through the motorand adapted to energize both the heater and motor coincidently, a secondary electric heater in parallel with said motor and said primary heater and from which the heat is removed or displaced by said fan, a switch controlling the circuit to the primary heater and motor and the shunt-circuit, and a switch independent of the switch in the primaryheater circuit for controlling the circuit to the secondary heater.

2. In an apparatus of the character described, one or more -heat-developing electric conductors forming a primary heater, mov able means as a fan for removing or displacing the heat from said heater, a motor for operating said movable means, an electric conductor continuously in series with both heater and motor while the circuit is closed through the motor and adapted to energize both the heater and nrotor coincidently, a secondary electric heater in parallel with said motor and said primary heater and from which the heat is removed or displaced by said fan, a manually-operated switch controlling the circuit to the primary heater and motor and the shunt-circuit,and a man ually-operated switch independent of the switch in the primaryheater circuit for controlling the circuit to the secondary heater.

3. In an apparatus of the character described, one or more heat-developing electric conductors forming a primary heater, movable means as a fan for removing or displacing the heat from said heater, a motor for operating said movable means, an electric conductor continuously in series with both heater and motor while the circuit is closed through the motor and adapted to energize both the heater and motor coincidently, a secondary electric heater in parallel with said motor and said primary heater and from which the heat is removed or displaced by said fan, a switch controlling the circuit to the primary heater and motor and the shunt-circuit, and a switch controlling the circuit to the secondary heater.

4. In an apparatus of the character described, one or more heat-developing electric conductors forming a primary heater, movable means as a fan for removing or displacing the heat from said heater, a motor for op erating said movable means, an electric conductor continuously in series with both heater and motor while the circuit is closed through the motor and adapted to energize both the heater and motor coincidently, a secondary electric heater in parallel with said motor and said primary heater and from which the heat is removed or displaced by said fan, means controlling the circuit to the pimary heater and motor and to the secondary heater and means controlling the sh un t-circuit independent of the main circuit.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 13th day of January, A. D. 189$).

- EDWIN F. PORTER. \Vitnesses:

A. L. Mnssnn, V. M. llIACLELLAN. 

